131–140 of 361 posts
It also means it is unlikely they were measuring wrong for multiple years.
My layman take is that Korean sample is just a better or different batch that is properly superconducting at room temperature.
Earlier quoted context omitted.
I have seen it posted that diamagnetic materials require multiple magnets stuck together to create field "pockets" (?) for the material to rest in. The few videos of lk99 show it reacting to a singular magnet. A property of superconductors that apparently diamagnetic materials don't have.
The term is “flux pinning”, and it only applies to the “quantum lock” effect. That is the specifically static hovering effect. The diamagnetism, importantly this means repulsion of both poles simultaneously and equally (this is how you can have these magnets spin, a regular magnet repels same poles and attracts opposites, diamagnets repel both poles), is simply a characteristic of the superconductor, but it alone wou…
Timestamp: https://youtu.be/RS7gyZJg5nc?t=2496
This appears to be a great result. "Room temperature" super conductor result? No. But this is basically showing there is some superconductivity in the sample, and cooler temperatures expose intrinsic band structures. Pretty exciting!
How is it exciting? It invalidates the original claim. We already have better SC.
There are multiple mentions of "extraterrestrial super islands", is this a mistranslation of the Meissner effect? Great term nonetheless.
The extraterrestrial super island of stability
Earlier quoted context omitted.
I have seen it posted that diamagnetic materials require multiple magnets stuck together to create field "pockets" (?) for the material to rest in. The few videos of lk99 show it reacting to a singular magnet. A property of superconductors that apparently diamagnetic materials don't have.
The term is “flux pinning”, and it only applies to the “quantum lock” effect. That is the specifically static hovering effect. The diamagnetism, importantly this means repulsion of both poles simultaneously and equally (this is how you can have these magnets spin, a regular magnet repels same poles and attracts opposites, diamagnets repel both poles), is simply a characteristic of the superconductor, but it alone wou…
There is a video from the Korean team showing LK99 moving when both poles of a large magnet is swung nearby, however the effect was a bit weak to conclusive.
Earlier quoted context omitted.
Multiple teams have said they had to produce 10 batches just to get one sample with properties worth reporting on. Perhaps the simplest explanation is that different teams are all ending up with different variations of a common material, with different impurities, crystal structure, etc. There's likely a whole zoo of interesting materials here!
Yes, I thought that that might be the case from day one. When they wrote that they had only a 10% success rate it was clear that they were not at all in control of sample purity. The big remaining question for me is what happens when they start traveling with the original sample to have another lab test their samples and how those results compare with both the original results and the independently recreated differen…
There will likely be years of not decades of looking at differences in the materials and performance of related materials to more fully explore this discovery.
Earlier quoted context omitted.
It's all unusual because it is uncharted territory. My guess would be assuming that it all pans out that this is due to various impurities and that it will take a while before we have a sample that is pure enough that all of these properties can be nailed down for good. What's strange is that drop at higher temps, that's either a measurement anomaly or something really odd.
> due to various impurities and that it will take a while before we have a sample that is pure enough that all of these properties can be nailed down for good. Do you think it will be "purity" or understanding material variance/specific impurity? It reminds me of Fogbank, the nuke material claimed to be "so secret they forgot how to make it." Part of the story of manufacturing difficulty was due to increased purity o…
When Hildebrand ran the baths the silver came out bright, and stuck to the objects; the minute he left troubles started. No one knew why. Shortly before he left to go into the antique business in Charleston he showed me the secret. It was his chewing tobacco, spat into the bath from time to time. From then on, one man in each shift chewed, and the problem was solved
Certainly no expert here but if you take the original video and replications at face value it does exhibit strong diamagnetism at room temperature. Superconductors are diamagnetic due to the Meissner effect at their superconducting temperature. This would mean LK99 is a superconductor at low temperature and separately be strongly diamagnetic at room temperature (no Meissner effect if it's not super conducting). Would…
It's all unusual because it is uncharted territory. My guess would be assuming that it all pans out that this is due to various impurities and that it will take a while before we have a sample that is pure enough that all of these properties can be nailed down for good. What's strange is that drop at higher temps, that's either a measurement anomaly or something really odd.
https://en.wikipedia.org/wiki/LK-99#Replication_attempts
> Claimed to have synthesized LK-99 and to have measured superconductivity up to a temperature of 110 kelvin. Claimed to have observed an abrupt drop in resistance between ~300K and 220K, aligning with the Korean LKK team's results. Claimed to have confirmed structural consistency with x-ray diffraction.
Earlier quoted context omitted.
That’s what I was thinking. In the video he brushes it off as a potential equipment malfunction, but perhaps it’s the effect everyone is looking for.
A sudden discontinuity like that but continuing the same curve and jumping back... that's equipment malfunction 99% of the time.
In American dollars that is -261.67F, a little chilly for room temp.